I was out the other day and I got a low voltage warning on Smartcraft and GPS when I fired the engine over (it started fine though) so, considering it lives on a smart charger most of the time, I think it's probably time for a new battery. It got me thinking about a backup. I don't have twin batteries and don't really want to go with the hassle of locating and wiring in another battery, split charger, switch etc. as I really don't have the console space. I then spotted this
in Diver mag and it sounds pretty good. I could use a standard power pack for phones whilst camping etc. but I thought this could be my backup power at sea. It will apparently start the engine, but even if not, could at least power a radio or gps for considerable time. It can be charged before a trip and topped up if needed from the 12v power socket I have in the console. I know this is more expensive than generic ebay/amazon ones but a UK company and warranty and water resistant rating is a but of a attraction for me.
Anybody had any experience with these or similar? Is it a worthy idea?